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Muon spin spectroscopy has been used to study in detail the onset of large-moment antiferromagnetism (LMAF) in UPt_3 as induced by Th substitution. Zero-field experiments have been carried out on a series of polycrystalline U_1-xTh_xPt_3 (0 <= x <= 0.05) samples in the temperature range 0.04 - 10 K. At low Th content (x <= 0.002) magnetic ordering on the time scale of the uSR experiment (10^-8 s) is not detected. For x = 0.005 a weak magnetic signal appears below T = 2 K, while for 0.006 <= xdoi:10.1103/physrevb.68.224421 fatcat:ata7zbkj6rhz7blxh22h3jvdsy